msm: vidc: Fix a regulator race condition for power collapse

With HW power collapse, driver hands off the regulator control to HW.
To touch any clocks, driver needs to acquire the control back from HW.
This change handles the regulator control properly between driver and HW.

CRs-Fixed: 680156

Change-Id: I6ce51a3d185d3ef4a8be1838001c1d76f31c4376
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>